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Aluminum Panel is Mottled after sanding, buffing, waxing

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Q. Hi,

Question folks.

Aluminum panel. Brought through all the grits 60, 80, 100, 120, 150, 180, 220, 320, then maroon, gray, gold, white non-woven pads. Then finally waxed.

The surface is very smooth and nice, all done with a random orbital sander.

But there is this weird mottling, inconsistency to the surface. I don't understand the process here - mostly a woodworker.

61675-1a 61675-1b

Please advise.

Pictures make it look a bit worse than it is.

I am able to get it really perfect on smaller pieces, but this inconsistency shows up on the larger pieces.

Thank you,

Rafi A.
- Berkeley, California
May 25, 2024

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